What started out as what could have been my best rental experience ever, unfortunately ended up being my worst! Checked in and got a "free" upgrade. Went to get in the car and noticed some mild damage on rear bumper and the facia missing from one of the vents, but otherwise all seemed nice.. didn't think to go as far as inspecting for chips in the windshield and photographing them! There was no attendant around to walk around with it even discuss the things noted. Went ahead and left in the car. Enjoyed the vehicle for 2 nights and returned it....in a massive line of cars early in the morning. Of course, again there was no attendant around. Didn't dare to leave the keys in the car, so looked for an attendant or drop box. Found a drop box at the front of all the cars and went ahead and dropped the key in and headed inside to get to our flights. After returning home, I received a notice from Sixt that they were charging me for damage done to the car i.e. chips in the windshield. Nothing ever hit the window while I had the car. Then a couple days later, I received another notice: they were claiming I lost the key. Then finally a bill...$225.60 of which most of was for loss of use. Assuming they didn't think to look in the drop KEY DROP BOX for the key! Absolutely rediculous. I will never again rent from them. Beware!!!!!